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Anisotropic Behavior of Compacted Decomposed Granite Soils  

Ham Tae-Gew (Dept. of Civil Engrg., Yamaguchi Univ.)
Hyodo Masayuki (Dept. of Civil Engrg., Yamaguchi Univ.)
Ahn Tae-Bong (Dept. of Railroad Construction and Environmental Engrg., Woosong Univ.,)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.7, 2005 , pp. 5-12 More about this Journal
Abstract
In order to investigate the strength and deformation anisotropy of compacted decomposed granite soils, a series of unsaturated-drained triaxial compression tests were performed. The sample used in the study was decomposed granite soil from Shimonoseki in Yamaguchi prefecture. The sample had three different angles of the axial (major principal) direction to the sedimentation plane (compaction plane), 0, 45 and 90 degrees. The compression strain of specimens subjected to isotropic compression was strongly influenced by the sedimentation angle. In addition, the time dependence was independent of the sedimentation angle in relation to the deformation behavior during the secondary compression process. The effect of the sedimentation angle on the triaxial compression strength and deformation was clear with low confining stress. Moreover, it was recognized that although the sedimentation angle and preparation methods were different, the dilatancy rate was relative to the increment of strength due to dilatancy. Therefore, it may be concluded that the compacted specimen has anisotropic mechanical properties similar to those of sand with initial fabric anisotropy.
Keywords
Anisotropy; Compacted decomposed granite soils; Deformation; Sedimentation angle; Strength;
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